diff --git a/voice_engine/output_mixer.cc b/voice_engine/output_mixer.cc
index 1b4d2e2..d46ee62 100644
--- a/voice_engine/output_mixer.cc
+++ b/voice_engine/output_mixer.cc
@@ -550,7 +550,7 @@
 // ----------------------------------------------------------------------------
 
 void OutputMixer::APMProcessReverseStream() {
-  if (_audioProcessingModulePtr->ProcessReverseStream(&_audioFrame) == -1) {
+  if (_audioProcessingModulePtr->ProcessReverseStream(&_audioFrame) != 0) {
     WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_instanceId, -1),
                  "AudioProcessingModule::ProcessReverseStream() => error");
   }